<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		手机号码:<input type ="text" id="input1" />
		
		<script>
			
			input1.onkeydown = function(e){
				console.log("键盘按钮下")
				console.log(e.key);
				console.log(e.keyCode);
				if(e.keyCode<48 || e.keyCode>57) // 数字范围48~57
				{
					// 阻止元素的默认行为
					event.preventDefault()
				}
			}
			
			input1.onkeyup = function(e)
			{
				console.log("键盘抬起")
			}
			
			input1.onkeypress = function(e)
			{
				console.log("键盘按了")
			}
			
			// 只能输入数字不能输入其他字母
			
		</script>
	</body>
</html>
